2,246 papers · page 105 of 113
Metaclasses provide control of object description, method compilation and more generally class behaviour. Consequently, they have been widely used in languages such as Smalltalk-80 or more recently CLOS by both users and implementers. Due to their powerful control of instances, c…
This paper presents our experience building an extendible software development environment using the object-oriented paradigm. We have found that object instances provide a natural way to model program constructs, and to capture complex relationships between different aspects of …
Function minimization techniques often require values for the first partial derivatives of the function at a point. Certain techniques, such as Newton's method, require the values of the second partial derivatives as well. The methods commonly used to obtain these values have cer…
We provide a formal agenda for teaching the object-oriented paradigm in a programming language independent manner, and a tool which supports our teaching approach. Our proposal for a comprehensive study of the subject includes an ordered set of objectives designed to guide the un…
The notions of class, subclass and virtual procedure are fairly well understood and recognized as some of the key concepts in object-oriented programming. The possibility of modifying a virtual procedure in a subclass is a powerful technique for specializing the general propertie…
ThingLab II is an object-oriented constraint programming system designed specifically for interactive user interface construction and implemented in Smalltalk-80 For constraints to be effective in building user interfaces, they must not impede the responsiveness of the user inter…
Comandos is a project within the European Strategic Programme for Research on Information Technology - ESPRIT and it stems from the identified need of providing simpler and more integrated environments for application development in large distributed systems.
Many numerical analysts and Lisp/Smalltalk programmers share the assumption that languages like Fortran are more appropriate for traditional, quantitative scientific programming than object-oriented languages. To show how straightforward application of object-oriented design to s…
We believe that the regime governing the patterns of sharing between objects, and of exchange of messages between them, should not be “hard-wired” into a programming language, but should be specifiable by the builders of a system to fit its particular requirements. This thesis ha…
Solo is a portable window interface written in the Common Lisp Object System (CLOS) object-oriented programming language. Solo provides a virtual window machine which is targeted to a host window system by implementing a set of host window system specific classes and methods for …
Central features of object-oriented programming are method inheritance and data abstraction attained through hierarchical organization of classes. Recent studies show that method inheritance can be nicely supported by ML style type inference when extended to labeled records. This…
This paper uses the persistent object system PCLOS to survey some problems and benefits of object persistence. The system is analyzed along several relevant dimensions. PCLOS provides object persistence for an object-oriented language. The insights gained on desirable and detrime…
Many tools and techniques exist for the modeling and analysis of computer and communication systems. These tools are often complex and tailored to a narrow range of problems. The system analysis task often requires coordinated use of multiple tools and techniques which is not sup…
The arrangement of classes in a specialization hierarchy has proved to be a useful abstraction mechanism in class-based object oriented programming languages. The success of the mechanism is based on the high degree of code reuse that is offered, along with simple type conformanc…
The programming environment described in this paper is an adaptation of Donald Knuth's concept of literate programming, applied to Smalltalk programs. The environment provides a multi-media document production system including media for Smalltalk class and method definitions.
Three important goals of next generation software development environments (SDEs) are extensibility, integration and broad scope. Our work on OROS is predicated on the hypothesis that a type model, incorporated into an environment's object manager, can contribute to achieving tho…
Six expert Smalltalk programmers and three expert procedural programmers were observed as they worked on a gourmet shopping design problem; they were asked to think aloud about what was going through their minds as they worked. These verbal protocols were recorded and examined fo…